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<!doctype html>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="mailto:https://mozilla.org" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1605610">
<link rel="help" href="https://drafts.csswg.org/web-animations/#extensions-to-the-element-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
let t = async_test("animations started before initial-containing-block creation properly function");
let loaded = false;
let finished = false;
let span;
function check() {
if (!loaded || !finished)
return;
assert_equals(getComputedStyle(span).opacity, "1", "Animation should be properly finished");
t.done();
}
document.addEventListener("DOMContentLoaded", function() {
span = document.createElement("span");
span.id = "myspan";
span.innerHTML = `Some content`;
document.body.appendChild(span);
let anim = span.animate([
{
opacity: "0",
},
{
opacity: "1",
},
], {
duration: 300,
});
anim.finished.then(t.step_func(function() {
finished = true;
check();
}));
});
window.addEventListener("load", t.step_func(function() {
loaded = true;
check();
}));
</script>
<!-- It is important that there are no more script after this stylesheet -->
<link rel="stylesheet" href="empty-sheet.css?pipe=trickle(d2)">
<body>
</body>
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